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Readily degradable resin composition and biodegradable container using the same

a biodegradable and resin composition technology, applied in the direction of rigid containers, synthetic resin layered products, packaging, etc., can solve the problems of inability to fully degrade the whole container in a considerable time, the biodegradable container has readily degradable portions and hardly degradable portions, and achieves excellent biodegradability

Active Publication Date: 2011-11-01
TOYO SEIKAN KAISHA LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010]A container or the like with an excellent biodegradability can be obtained from the readily degradable resin composition according to the present invention.

Problems solved by technology

However, a packaging container using such a biodegradable resin composition is sequentially degraded from the surface of the container.
Thus, complete degradation of the whole container takes a considerable time.
In addition, there is a problem that such a biodegradable container has readily degradable portions and hardly degradable portions, since the degradation rate is influenced by the internal structure of the resin such as the crystallinity of the resin and the molecular orientation thereof.

Method used

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  • Readily degradable resin composition and biodegradable container using the same
  • Readily degradable resin composition and biodegradable container using the same
  • Readily degradable resin composition and biodegradable container using the same

Examples

Experimental program
Comparison scheme
Effect test

example 1

Formation of Cast Film of Blended Polymer

[0040]0.80 g of polylactic acid (LACEA H-100 manufactured by Mitsui Chemicals, Inc.) and 0.20 g of polyethylene oxalate were dissolved in 10 to 12 ml of an HFIP solvent (hexafluoroisopropanol manufactured by Central Glass Co., Ltd.) to achieve a content of polyethylene oxalate in polylactic acid of 20% by weight, and then the mixture was cast on a Petri dish. After the cast, overnight drying was performed in a vacuum dryer kept at 40° C. The film thickness after drying was 40 μm.

(Enzymatic Degradation Test)

[0041]An enzymatic degradation solution was prepared by adding 12 μl of the enzyme solution into 10 ml of the 0.01 M Tris-HCl buffer (pH 8.0). Into the enzymatic degradation solution, the cast film cut into 1 cm×2 cm was immersed, and shaken at 37° C. and at 50 rpm. 16 hours, 48 hours, 120 hours, and 168 hours after the start of the degradation, the degradation state of the film was visually observed and the enzyme solution was exchanged. T...

example 2

[0042]Example 2 was conducted in the same manner as that in Example 1 except that the temperature in the enzymatic degradation test was changed to 60° C.

example 3

[0043]Example 3 was conducted in the same manner as that in Example 1 except that the content of polyethylene oxalate was changed to 5% by weight.

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Abstract

Disclosed is a readily degradable resin composition having excellent biodegradability. Specifically disclosed is a readily degradable resin composition comprising: an aliphatic polyester (A) which has biodegradability; and an aliphatic polyester (B) which has a solution viscosity (η inh) of 0.25 dl / g or less as measured in a mixed solvent composed of m-chlorophenol and 1,2,4-trichlorobenzene at a weight-based ratio of 4:1 at a concentration of 0.4 g / dl and at a temperature of 30° C. and a melt viscosity of 50 Pa S or less as measured at 190° C. at a shear rate of 1 rad / s and is capable of biodegraded at a more rapid degradation rate than the aliphatic polyester (A). Also disclosed is a readily degradable resin composition comprising: an aliphatic polyester (A) which has biodegradability; and an aliphatic polyester (B′) which, when hydrolyzed, can release an acid showing a pH value of 2.0 or less when dissolved in water at a concentration of 0.005 g / ml and is capable of biodegraded at a more rapid degradation rate than the aliphatic polyester (A). Further disclosed is a biodegradable container comprising the readily degradable resin composition.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a National Stage of International Application No. PCT / JP2007 / 068633, filed Sept. 26, 2007, which claims the benefit of Japanese Application No. 2006-260540, filed Sept. 26, 2006, the contents of all of which are incorporated by reference herein in their entirety.FIELD OF THE INVENTION[0002]The present invention relates to a readily degradable resin composition constituting a biodegradable container that facilitates resource recycling.BACKGROUND ART[0003]Biodegradable polylactic acid resin compositions and the like are proposed as packaging materials (see Patent Documents 1 and 2). However, a packaging container using such a biodegradable resin composition is sequentially degraded from the surface of the container. Thus, complete degradation of the whole container takes a considerable time. In addition, there is a problem that such a biodegradable container has readily degradable portions and hardly degradable portions,...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): B29D22/00B29D23/00B32B1/08
CPCB65D65/466C08L67/02C08L67/04C08L2201/06Y10S220/30Y10T428/1352Y10T428/1397Y10T428/139C08L2666/18Y02W90/10B65D65/46C08L67/00C08L101/16
Inventor YOSHIKAWA, SEISHIYOSHIDA, MITSUHIROKOGURE, MASAHITO
Owner TOYO SEIKAN KAISHA LTD
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